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Continuity mistake: When Buckingham is about to be arrested, the camera is looking directly at him. At this angle, his black fur collar is flipped up, covering the neck of his white shirt. When the scene changes to a wide shot behind him, the collar is folded down. (00:35:00 - 00:35:50)
Answer: Henry asks for a volta which was a type of dance as well as the general type of music played for it. It would be like requesting a waltz or tango.